eng Science and Education Publishing American Journal of Energy Research 2328-7330 2016-08-03 4 2 27 34 10.12691/ajer-4-2-1 AJER2016421 article I. M. Kuzmenko ozirno@ukr.net 1 O. V. Makarchuk 1 Heat-and-Power Engineering Department, NTUU “Kyiv polytechnic institute”, Kyiv, Ukraine Mass transfer coefficient for contacting conditioning is determined experimentally and theoretically for steady air. Contribution of diffusion and convection component into mass transfer is estimated. The assessment showed that the contribution of the convection component into mass transfer can be neglected. Thickness of diffusional mass transfer layer was experimentally measured and it less than the theoretical values of displacement layer thickness till 10 times. Therefore the experimental value of mass transfer coefficient exceeds by one order the theoretically calculated ones. The criteria equation is recommended for calculation of mass transfer coefficient at steady air flow in a channel. http://pubs.sciepub.com/ajer/4/2/1/ajer-4-2-1.pdf mass transfer contacting conditioner displacement layer water film